/Engine/Source/Runtime/Engine/Public/MaterialHLSLTree.h
void AddInterpolator ( const [FExpression](API\Runtime\Engine\HLSLTree\FExpression) * Expression, const [FRequestedType](API\Runtime\Engine\HLSLTree\FRequestedType) & RequestedType, const [FPreparedType](API\Runtime\Engine\HLSLTree\FPreparedType) & PreparedType )